1 | /* Boost interval/detail/ia64_rounding_control.hpp file |
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2 | * |
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3 | * Copyright 2006-2007 Boris Gubenko |
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4 | * |
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5 | * Distributed under the Boost Software License, Version 1.0. |
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6 | * (See accompanying file LICENSE_1_0.txt or |
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7 | * copy at http://www.boost.org/LICENSE_1_0.txt) |
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8 | */ |
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9 | |
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10 | #ifndef BOOST_NUMERIC_INTERVAL_DETAIL_IA64_ROUNDING_CONTROL_HPP |
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11 | #define BOOST_NUMERIC_INTERVAL_DETAIL_IA64_ROUNDING_CONTROL_HPP |
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12 | |
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13 | #if !defined(ia64) && !defined(__ia64) && !defined(__ia64__) |
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14 | #error This header only works on ia64 CPUs. |
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15 | #endif |
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16 | |
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17 | #if defined(__hpux) |
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18 | |
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19 | # include <fenv.h> |
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20 | |
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21 | namespace boost { |
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22 | namespace numeric { |
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23 | namespace interval_lib { |
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24 | namespace detail { |
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25 | |
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26 | |
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27 | struct ia64_rounding_control |
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28 | { |
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29 | typedef unsigned int rounding_mode; |
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30 | |
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31 | static void set_rounding_mode(const rounding_mode& mode) { |
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32 | fesetround(mode); } |
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33 | static void get_rounding_mode(rounding_mode& mode) { mode = fegetround(); } |
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34 | |
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35 | static void downward() { set_rounding_mode(FE_DOWNWARD); } |
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36 | static void upward() { set_rounding_mode(FE_UPWARD); } |
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37 | static void to_nearest() { set_rounding_mode(FE_TONEAREST); } |
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38 | static void toward_zero() { set_rounding_mode(FE_TOWARDZERO); } |
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39 | }; |
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40 | |
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41 | } // namespace detail |
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42 | |
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43 | extern "C" { |
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44 | float rintf(float); |
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45 | double rint(double); |
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46 | long double rintl(long double); |
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47 | } |
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48 | |
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49 | template<> |
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50 | struct rounding_control<float>: |
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51 | detail::ia64_rounding_control |
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52 | { |
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53 | static float force_rounding(const float r) |
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54 | { volatile float _r = r; return _r; } |
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55 | static float to_int(const float& x) { return rintf(x); } |
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56 | }; |
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57 | |
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58 | template<> |
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59 | struct rounding_control<double>: |
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60 | detail::ia64_rounding_control |
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61 | { |
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62 | static const double & force_rounding(const double& r) { return r; } |
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63 | static double to_int(const double& r) { return rint(r); } |
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64 | }; |
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65 | |
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66 | template<> |
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67 | struct rounding_control<long double>: |
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68 | detail::ia64_rounding_control |
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69 | { |
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70 | static const long double & force_rounding(const long double& r) { return r; } |
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71 | static long double to_int(const long double& r) { return rintl(r); } |
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72 | }; |
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73 | |
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74 | } // namespace interval_lib |
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75 | } // namespace numeric |
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76 | } // namespace boost |
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77 | |
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78 | #undef BOOST_NUMERIC_INTERVAL_NO_HARDWARE |
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79 | |
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80 | #endif /* __hpux */ |
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81 | |
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82 | #endif /* BOOST_NUMERIC_INTERVAL_DETAIL_IA64_ROUNDING_CONTROL_HPP */ |
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83 | |
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